Is Santorum Surging?

CNN and Time have a new Iowa poll finding Romney at 25 percent and Paul at 22 percent. The most unexpected result:

[T]he biggest beneficiary of Gingrich’s collapse appears to be former Pennsylvania Senator Rick Santorum, who’s rocketed into third place with 16%, a dramatic 11-point climb in three short weeks. Santorum now leads among born-again Christians, and is tied with Paul and Romney among self-described conservatives and Tea Party supporters. The surge by Santorum, who’s quietly made stops in each of Iowa’s 99 counties and won the endorsement of some of the state’s top evangelical leaders, only adds suspense to next week’s caucuses, the outcome of which remains incredibly unpredictable.